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TSCHAN® POSIFLEX® - ZEHUU 151-372

Double engagement design
Installation dimension can be varied by shortening the universal hubs
Sizes: 151 - 372

ZEHUU

CAD Size D1 D2 E L L1 L4 l2 m J Grease
    mm mm mm mm mm mm mm kg kgm2 dm3
  3 84 50.9 3 193.4 50 31 95.2 3.8 0.003 0.022
  4 95 60.4 3 205 65 37 101 8.5 0.005 0.036
  5 120 82.6 3 238 68 35 117.5 11.4 0.015 0.063
  6 140 100 6 266 80 46 130 18 0.033 0.114
  8 168 121 6 298 95 57.5 146 27.6 0.078 0.201
  10 190 143 6 336 102 61 165 42.2 0.158 0.27
  151 186 151 5 335 174 133.5 165 55.7 0.219 0.36
  178 216 178 6 346 206 157 170 74.4 0.44 0.52
  213 254 213 6 386 227 178.5 190 116 0.956 0.8
  235 282 235 8 408 254 202 200 150 1.55 0.98
  263 317 263 8 448 276 224 220 206 2.71 1.51
  286 346 286 8 508 319 263.5 250 273 4.27 2.02
  316 376 316 8 568 346 290 280 357 6.71 2.43
  372 436 372 10 710 383 326.5 350 584 14.73 3.29

General features

  • Torsionally rigid gear coupling made of high-quality steel
  • Compensates for angular,radial and axial shaft offset
  • Suitable for use in temperatures up to +130°C if special seals are used
  • Available with split sleeve (ZEA / ZEB - ZEA model range also available in ZEB design) and single-piece sleeve (ZEH)
  • The elastic ring can be replaced without having to move the coupled machines (multi-part models)
  • Bores up to 320 mm
  • Torques up to TKn = 290,000 Nm / TKmax = 580,000 Nm
  • Speeds up to nmax = 5,000 rpm

General description

The POSIFLEX® coupling is a torsionally rigid twin cardanic gear coupling.

Toothing

The coupling housings have a straight internal toothing whilst the hubs have an external toothing with a chased variable radius. As a result, the hubs can move spatially within the housing and thus compensate angular, radial and axial shaft misalignment of the adjoined shaft ends within specified tolerances. Depending on coupling type and size, the standard toothing permits an angular misalignment of up to 0.75 degrees per toothing-plane and an axial movement of several millimetres. The max. possible radial shaft displacement is dependent on the distance between the two toothing planes. Other toothing geometries can be used for further specific applications.

Materials

High-grade tooth profiles and grease with ultra high-pressure additives guarantee low-restoring forces and a long serviceable life. The material used is forged steel with an apparent yielding point of at least 350 N/mm2. Special materials can be used for further specific applications. Sealing is carried out using O-rings and lip-seals of buna N. The housings are centred and held together by fit-bolts and self-locking nuts.

Temperature

The use of special seals permits the temperature limit to be raised to 130 °C.

Balance

At peripheral speeds upwards of 30 m/s it is advisable to dynamically balance the coupling.

Special applications

If greater misalignements are anticipated at higher speeds and torques, an examination is necessary, performed with the assistance of a special computing programme. This is independent of the determined size. The value TKmax may not be exceeded in any state of operation (start-up, electrical short circuit, blocking, etc.).

Tolerances and standards

The bore tolerance is ISO H7, if not differently ordered. The bore diameters listed refer to keyways to DIN 6885/1.

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